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HAYNES® Alloys

Aqueous Corrosion Resisitance

Although not specifically designed for use in applications which require resistance to aqueous corrosion, 242® alloy does exhibit resistance in some media which compares favorably with that exhibited by traditional corrosion-resistant alloys. Data shown for 242 alloy was generated for samples tested in the mill annealed condition.

Corrosive Media Temperature Exposure Corrosion Rate, Mils/year (mm/year)
242® B-2 C-22® N
- °F °C h mils mm mils mm mils mm mils mm
5% HF 175 79 24 14 0.36 12 0.30 25 0.64 20 0.51
48% HF 175 79 24 32 0.81 25 0.64 27 0.69 31 0.79
70% HF 125 52 24 35 0.89 66 1.68 32 0.81 48 1.22
10% HCI Boiling 24 22 0.56 7 0.18 400 10.16 204 5.18
20% HCl Boiling 24 41 1.04 15 0.38 380 9.65 - -
55% H3PO4 Boiling 24 3 0.08 4 0.10 9 0.23 - -
85% H3PO4 Boiling 24 4 0.10 4 0.10 120 3.05 - -
10% H2PO4 Boiling 24 2 0.05 2 0.05 11 0.28 46 1.17
50% H2PO4 Boiling 24 5 0.13 1 0.03 390 9.91 - -
99% ACETIC Boiling 24 <1 <0.03 1 0.03 - Nil - -

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